NET 添加图片水印代码,Asp.Net代码库,德仔网

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【Asp.Net】 NET 添加图片水印
作者:Dezai.CN / 发布于2012/8/13/ 520
NET 添加图片水印
<div>using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;</div>
<div>namespace Pub.Class
{
 /// <summary>
 /// 添加水印类 只支持添加图片水印
 /// </summary>
public class Watermark
 {
 #region 私有成员
 private string modifyImagePath=null;
 private string drawedImagePath=null;
 private int rightSpace;
 private int bottoamSpace;
 private int lucencyPercent=70;
 private string outPath=null;
 #endregion</div>
<div> #region 构造器
 /// <summary>
 /// 构造函数
 /// </summary>
 public Watermark() { }
 #endregion</div>
<div> #region 属性
 /// <summary>
 /// 获取或设置要修改的图像路径
 /// </summary>
 public string ModifyImagePath
 {
 get{return this.modifyImagePath;}
 set{this.modifyImagePath=value;}
 }
 /// <summary>
 /// 获取或设置在画的图片路径(水印图片)
 /// </summary>
 public string DrawedImagePath
 {
 get{return this.drawedImagePath;}
 set{this.drawedImagePath=value;}
 }
 /// <summary>
 /// 获取或设置水印在修改图片中的右边距
 /// </summary>
 public int RightSpace
 {
 get{return this.rightSpace;}
 set{this.rightSpace=value;}
 }
 /// <summary>
 /// 获取或设置水印在修改图片中距底部的高度
 /// </summary>
 public int BottoamSpace
 {
 get{return this.bottoamSpace;}
 set{this.bottoamSpace=value;}
 }
 /// <summary>
 /// 获取或设置要绘制水印的透明度,注意是原来图片透明度的百分比
 /// </summary>
 public int LucencyPercent
 {
 get{return this.lucencyPercent;}
 set { if(value>=0&&value<=100) this.lucencyPercent=value; }
 }
 /// <summary>
 /// 获取或设置要输出图像的路径
 /// </summary>
 public string OutPath
 {
 get{return this.outPath;}
 set{this.outPath=value;}
 }
 #endregion</div>
<div> #region 开始绘制水印 DrawImage
 /// <summary>
 /// 开始绘制水印
 /// </summary>
 /// <example>
 /// 
 /// Watermark wm = new Watermark();
 /// wm.DrawedImagePath= Server.MapPath("") + "/upfile/" + "backlogo.gif";
 /// wm.ModifyImagePath=path; 
 /// wm.RightSpace=184;
 /// wm.BottoamSpace=81;
 /// wm.LucencyPercent=50;
 /// wm.OutPath=Server.MapPath("") + "/upfile/" + fileName + "_new" + extension;
 /// wm.DrawImage();
 /// 
 /// //保存加水印过后的图片,删除原始图片 
 /// mFileName=fileName + "_new" + extension;
 /// if(File.Exists(path)) { File.Delete(path); } 
 /// 
 /// </example>
 public void DrawImage()
 {
 Image modifyImage=null;
 Image drawedImage=null;
 Graphics g=null;
 try { 
 modifyImage=Image.FromFile(this.ModifyImagePath);//建立图形对象
 drawedImage=Image.FromFile(this.DrawedImagePath);
 g=Graphics.FromImage(modifyImage);
 
 int x=modifyImage.Width-this.rightSpace;//获取要绘制图形坐标
 int y=modifyImage.Height-this.BottoamSpace;
 
 float[][] matrixItems ={//设置颜色矩阵
 new float[] {1, 0, 0, 0, 0},
 new float[] {0, 1, 0, 0, 0},
 new float[] {0, 0, 1, 0, 0},
 new float[] {0, 0, 0, (float)this.LucencyPercent/100f, 0},
 new float[] {0, 0, 0, 0, 1}};</div>
<div> ColorMatrix colorMatrix = new ColorMatrix(matrixItems);
 ImageAttributes imgAttr=new ImageAttributes();
 imgAttr.SetColorMatrix(colorMatrix,ColorMatrixFlag.Default,ColorAdjustType.Bitmap);
 
 g.DrawImage(//绘制阴影图像
 drawedImage,
 new Rectangle(x,y,drawedImage.Width,drawedImage.Height),
,0,drawedImage.Width,drawedImage.Height,
 GraphicsUnit.Pixel,imgAttr);
 
 string[] allowImageType={".jpg",".gif",".png",".bmp",".tiff",".wmf",".ico"};//保存文件
 FileInfo file=new FileInfo(this.ModifyImagePath);
 ImageFormat imageType=ImageFormat.Gif;
 switch(file.Extension.ToLower()) {
 case ".jpg": imageType=ImageFormat.Jpeg; break;
 case ".gif": imageType=ImageFormat.Gif; break;
 case ".png": imageType=ImageFormat.Png; break;
 case ".bmp": imageType=ImageFormat.Bmp; break;
 case ".tif": imageType=ImageFormat.Tiff; break;
 case ".wmf": imageType=ImageFormat.Wmf; break;
 case ".ico": imageType=ImageFormat.Icon; break;
 default: break;
 }
 MemoryStream ms=new MemoryStream();
 modifyImage.Save(ms,imageType);
 byte[] imgData=ms.ToArray();
 modifyImage.Dispose();
 drawedImage.Dispose();
 g.Dispose();
 FileStream fs=null;
 if(this.OutPath==null || this.OutPath=="") {
 File.Delete(this.ModifyImagePath);
 fs=new FileStream(this.ModifyImagePath,FileMode.Create,FileAccess.Write);
 } else {
 fs=new FileStream(this.OutPath,FileMode.Create,FileAccess.Write);
 }
 if(fs!=null) {
 fs.Write(imgData,0,imgData.Length);
 fs.Close();
 }
 } finally {
 try {
 drawedImage.Dispose();
 modifyImage.Dispose();
 g.Dispose();
 } catch{}
 }
 }
 #endregion
 }
}
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